diff options
| -rw-r--r-- | mm/rmap.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/mm/rmap.c b/mm/rmap.c index 65de3832123e..9b40c3feba3e 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1238,6 +1238,13 @@ void page_add_anon_rmap(struct page *page, struct vm_area_struct *vma, if (unlikely(!folio_test_anon(folio))) { VM_WARN_ON_FOLIO(!folio_test_locked(folio), folio); + /* + * For a PTE-mapped large folio, we only know that the single + * PTE is exclusive. Further, __folio_set_anon() might not get + * folio->index right when not given the address of the head + * page. + */ + VM_WARN_ON_FOLIO(folio_test_large(folio) && !compound, folio); __folio_set_anon(folio, vma, address, !!(flags & RMAP_EXCLUSIVE)); } else if (likely(!folio_test_ksm(folio))) { |